Pump-valve-actuating mechanism.



Patented sept. n, |900.

Inventor. ZZ.,

,torne-y.

am wenns no. wom uw Asnmmnm n G. B. PETSCHE. PUMP VALVE ACTUATINGMECHANISM.

(Application filed July 31, 1897.)

(No Mogel.)

.NNEW

Witnesses. 76%71`m7i Wai UNITED STATES PATENT OEEICE.

GUSTAV BERNHARD PETSOHE, OF PHILADELPHIA, PENNSYLVANIA, AS-

SIGNOR TO THE SOUTHWARK FOUNDRY AND MACHINE COMPANY,

OF SAME PLACE.

PUIVI P-VALVE-ACTUATING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 657 ,671, datedSeptember 11, 1900.

Application Aiea my s1. uit?.

`Serial No. 645,630. (No model.)

To rr/ZZ whom, t may concern.-

Be it known that I, GUsTAv BERNHARD PETSCHE, a subject of the Emperor ofGermany, residing in the city and county of Philadel phia, in the Stateof Pennsylvania, have invented a certain new and useful Improvement inPunip-Valve-Actuating Mechanism, of which the following isa true andexactdescription,l reference being had to the accompan ying drawings,which form a part thereof.

My invention relates to the construction and mode of operation ofmechanism for actuating the delivery and suction valves of pu mps,particularly of pum ps used for liquids.

In another application filed by me .Iuly 3l, 1897, Serial No. 646,629, Ihave described and claimed a new method and apparatus for actuatingliquid pump-valves, in which I act upon the valves with intermittentyielding pressure applied at or slightly before the normal point in themotion of the plunger at which the valves should open or close and soproportioned with reference to the resistance to the motion of the valvedeveloped by inequalities of pressure that the valve will move not onlywhen the pressure upon its inner and outer faces is substantiallybalanced, but move them with great energy, thus insuring that the valvesshall open or close at the critical moment and without imposingdangerous strains upon the valve-actuating mechanism. My said inventionis especially designed with reference to the use of slidinglaterally-moving valves, as by their use the obstruction to the passageof water through the valve which is met with in the ordinary type ofclack-valve is avoided, with great gain to the efliciency of the pump.

My present invention embodies the essential features forming thesubject-matter of my separate application mentioned above, but hasespecially for its object to provide for the operation of the valvesthrough their lap by means of the duid displaced by the plunger duringthat portion of its movement when the delivery-valve is closed andmoving over its lap either in a direction to close or a direction toopen, thus enabling the valves to open and close slightly after the Howof uid from the pump-chamber begins and slightly before it ceases, whichin the case of the use of slot-ted valves avoids one source of possiblediiiculty and in the case of any valve will be recognized as desirable,since it entirely obviates the risk of a return flow through the valvewhile in the act 0f closing.

The nature of in'y improvements will be best understood as described inconnection with t-he drawings, in which they are illustrated, and inwhich-'- Figure l is an elevation, partly in section, of a pump providedwith my improvements. Fig. 2 is a side elevation of the same apparatus,showing the valve-actuating cylinder in section. Figs. 3 and 4 aresectional views of the pilot-valves. Fig. 5 is a diagram illustratingthe action of the valve with respect to the flow of water and the motionof the valves; and Fig. 6 is asectional elevation of a valve-actuatingcylinder of the type which I preferto employ and which althoughembodying several features of importance invented by me is not hereinclaimed, as it forms in some features the subject-matter of myapplication for Letters Patent tiled July 3l, 1897, Serial No. 646,634,and in combination with the pump the subject-mattei' of other claimsforming a part of my application filed July 31, 1897, Serial No.646,629.

A and A are the pump-chambers of a double-acting pump, A2 indicating thedeliveryports, and A3 the suction-ports.

B is the suction-main, and B the deliverymain. v

C is the plunger, connecting by a piston-rod O/ with an engine,(indicated at 02,) of which the main crank-shaft is shown at C3.

D D indicate the delivery-valves, which, as shown, are slidinggridiron-valves,pre ferably having an appreciable but slight freedom ofmotion between their seats and their back bearings, (indicated at E.) Asixty-fourth of an inch I have found in practice to be sufficient,although slightly-greater play may be provided for without deleteriousei'ects.

D D indicate the suction-valves, which are similar to the valves D.

D2 D2indicate the valve-actuating rod, and

D3 l)3 valve-rods connecting the delivery and suction valves inpairs-that is to say, the delivery-valve of the one cylinder with thesuction-valve of the other cylinder-anarrangement which is appropriate,because these val ves should move substantially at the same time both toopen and close.

F F indicate valve-actuating cylinders, which I haveshown in Figs. Land2 in a simple and practical diagrammatic form. Preferably I constructthe cylinders as indicated in Fig. 6.

G G indicate the pistons, Workingin the cylinders F and connected withthe valve-stems D2. From the opposite ends ofthe cylinder F lead portsF' F2, communicating with the valve-chamber K, from which leads also anexhaust-passage F3 and to which leads a conduit. H or H', communicatingat its other end with one ofthe pump-chambers A or A', and preferablyeach of these conduits should be provided with a non-return valve, asindicated at h or 71,', for the purpose ot' preventing a reiiux actionof water in the conduitand of maintaining it at all times substantiallyfull of fluid.

I is a valve working in the valve-chamber K,act u ated by apositively-moving connection on the engine. As shown, it is connected,through a lever l', link J, and crank-connecting device J', with a linkJ2, operated by an eccentric J3 on the main shaft of the engine, the link motion being such as will actuate the Valve to connect one port, asF', with the pump-chamber through a conduit H or I-I' at or slightlybefore the time when the valve should move, the same motion of thepilotvalve connecting the other port F2 with the exhaust-passage F3.

Referring now to the diagram Fig. 5, the distance from the point 3 tothe point 6 indicates the total motion of the valve, of which theportion between the points 3 5 indicates the valve-lap. The line from 3to 4 represents the total stroke of the pump, While the line rising in acurve from the point 3, running then in a straight line along the line 6to l2 and falling in a curve to the point 4, represents approximatelythe relative motion of the valve with respect to the motion of theplunger, the true point of opening being at the point marked 7 and thetrue point of closing being at the point marked 8. It will be obviousthat before the valve in opening has crossed the line 5 to ll at thepoint 7 and thatin closing after it has passed the point 8 on the saidline the plunger will still force out of the cylinder a volume of waterwhich is approximately represented at the beginning by the rectangle 3 5'7 9 and at the close of the stroke by the rectangle 10 8 ll 4, but thepilot-valve I being opened at the points substantially correspondingwith the points '7 and 8 the water passing from the pump-chamber beforethe valve-opening point passes to cylinder F and is utilized to partlyopen the valve, the capacity of the cylinder to receive fluidgbeingregulated by the amount oi' Huid expelled from the pump-chamber whilethe pump-valve is passing through its lap and so that said volume ofiiuid will move the valve through its lap. In the saine way at the endof the stroke of the plunger the pilot-valve being opened substantiallyat the point 8 the fluid expelled from thepump-chamber during the timewhen the pump-valve is closing its lap will be utilized to move thealreadyclosed valve through its lap.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a pump the combination with a valve leading to or from the plunger-chamber ofan actuating-cylinder, a piston therein operativelyconnected to the pump-Valve, a conduit leading to the actuating-cylinderfrom the pump-chamber and a pilot-valve controlling the admission andexhaust of the Huid from the pump-cylinder to and from theactuating-cylinder the said actuating-cylinder being of a capacity toreceive behind its` piston the iuid forced out of the pum p-chamberWhile the pump-valve is passing through its lap in opening andclosingand the piston in the actuating-cylinder is making a corresponding partof its stroke.

2. In a pump the combination with a valve leading to or from t-heplunger-chamber of an actuating-cylinder, a piston therein operativelyconnected to the pump-valve, a conduit leading to the actuating-cylinderfrom the pump-chamber, a pilot-valve controlling the admission andexhaust of the iuid from the pump-cylinder to and from theactuatingcylinder and a non-return valve situated in the conduit leadingfrom the pump-chamber to the actuating-cylinder the saidactuatingcylinder being of a capacity to receive behind its piston theliuid forced out of the pumpchamber While the pumpvalve is passingthrough its lap in opening and closing and the piston in theactuating-cylinder is making a corresponding part of its stroke.

3. In a pump the combination with a laterally-moving or slide valveleading to or from the plunger-chamber and having aslight freedom ofmovement to and from its seat, of an actuating-cylinder, a pistontherein operatively connected to the pump-valve, a conduit leading tothe actuating-cylinder from the pump-chamber and a pilot-valvecontrolling the admission and exhaust of the Huid from the pump-cylinderto and from the actuating-cylinder being of a capacity to receive behindits piston the fluid forced out of the pump-chamber while the pu mp-valve is passing through its lap in opening and closing and the pistonin the actuating-cylinder is making a corresponding part of its stroke.

GUS'IAV BERNHARD PE'ISCHE.

Witnesses:

CHAs. F. MYERS, D. STEWART.

TOO

IIO

